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EMC2103 Datasheet(PDF) 64 Page - SMSC Corporation

Part # EMC2103
Description  RPM-Based Fan Controller with HW Thermal Shutdown
PDF  84 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

EMC2103 Datasheet(HTML) 64 Page - SMSC Corporation

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RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
Revision 0.85 (01-29-08)
64
SMSC EMC2103
DATASHEET
Bit 4 - RPM / PWM - This bit selects the data format for the LUT drive settings.
‘0’ (default) - The Look Up Table drive settings are RPM TACH count values for use by the RPM
based Fan Speed Control Algorithm. The Look Up Table drive settings should be loaded highest
value to lowest value (to coincide with the inversion between TACH counts and actual RPM).
‘1’ - The Look Up Table drive settings are PWM duty cycle values and are used directly. The drive
settings should be loaded lowest value to highest value.
Bit 2 - TEMP3_CFG - Determine the temperature channel that is used for the Temperature 3 inputs to
the Look Up Table. If the External Diode 3 channel is not enabled, then the Temperature 3 inputs are
not used by the Look Up Table.
‘0’ (default) - The External Diode 3 channel is used by the Fan Look Up Table (if enabled).
‘1’ - The data written into the Pushed Temperature 1 Register is used by the Fan Look Up Table.
Bit 0 - TEMP4_CFG - Determine the temperature channel that is used for the Temperature 4 inputs to
the Look Up Table.
‘0’ (default) - The Internal channel is used by the Fan Look Up Table.
‘1’ - The data written into the Pushed Temperature 2 Register is used by the Fan Look Up Table.
6.33
Look Up Table Registers
Table 6.49 Look Up Table Registers
ADDR
R/W
REGISTER
RPM /
PWM
B7
B6
B5
B4B3
B2B1
B0
DEFAULT
51h
R/W
LUT Drive
Setting 1
‘0’
4096
2048
1024
512
256
128
64
32
FBh
‘1’
128
64
32
16
8
4
2
1
52h
R/W
LUT Ext
Diode 1
Setting 1
X
-
64
32
16
8
4
2
1
7Fh
(127°C)
53h
R/W
LUT Ext
Diode 2
Setting 1
X
-
64
32
16
8
4
2
1
7Fh
(127°C)
54h
R/W
LUT Temp 3
Setting 1
X
-
64
32
16
8
4
2
1
7Fh
(127°C)
55h
R/W
LUT Temp 4
Setting 1
X
-
64
32
16
8
4
2
1
7Fh
(127°C)
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
. . .
74h
R/W
LUT Drive
Setting 8
‘0’
4096
2048
1024
512
256
128
64
32
92h
‘1’
128
64
32
16
8
4
2
1
75h
R/W
LUT Ext
Diode 1
Setting 8
X
-
64
32
16
8
4
2
1
7Fh
(127°C)
76h
R/W
LUT Ext
Diode 2
Setting 8
X
-
64
32
16
8
4
2
1
7Fh
(127°C)
77h
R/W
LUT Temp 3
Setting 8
X
-
64
32
16
8
4
2
1
7Fh
(127°C)



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